Where do I begin

BIGDADDY1967

2001 MAZDA MILLENIA

85,000 MILES

Where do I begin. Several things have been done to fix this car. No engine light. But when the car get up to highway speeds ( 60-70 mph) the car flutters and feels ready to cutoff but doesn't. O2 sensors, spark plugs, supercharger, egr valve, pcm computer, map sensor, maf sensor, all new vacuum hoses (could be the problem because the hoses are hard to put in proper places) have all been replaced. No fault codes in the computer. Fuel pump and regulator was checked. Help!

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Sunday, February 17th, 2013 AT 4:06 AM

1 Reply

ASEMASTER6371

EXPERT

25,476 POSTS

What is the actual fuel pressure reading?

Has the back pressure been checked for the cat converter? Thats my bet.